package main

import (
	"fmt"
	"log"
	"time"
)

// OptimizedEbbFlow 优化后的EbbFlow架构
type OptimizedEbbFlow struct {
	// 核心组件
	waterbear    *WaterBearBFT
	cbr          *CBRProtocol
	turritopsis  *TurritopsisManager
	
	// 配置
	nodeID       int
	totalNodes   int
	faultyNodes  int
	currentEpoch int
	
	// 状态
	isActive     bool
	logger       *log.Logger
}

// CBRProtocol 集成了密钥刷新和重配置的CBR协议
type CBRProtocol struct {
	// CBR核心功能
	reconfiguration *CBRReconfiguration
	keyRefresh      *CBRKeyRefresh
	proofChain      *ProofChain
	
	// 状态
	isActive        bool
	currentThreshold int
	membership      []string
	logger          *log.Logger
}

// CBRReconfiguration CBR重配置功能
type CBRReconfiguration struct {
	oldCommittee    []string
	newCommittee    []string
	oldThreshold    int
	newThreshold    int
	reconfigLatency time.Duration
}

// CBRKeyRefresh CBR密钥刷新功能
type CBRKeyRefresh struct {
	oldKeys         map[string][]byte
	newKeys         map[string][]byte
	refreshLatency  time.Duration
	successRate     float64
}

// ProofChain 证明链，与CBR紧密耦合
type ProofChain struct {
	blocks          []*ProofBlock
	currentBlock    *ProofBlock
	chainLatency    time.Duration
	verificationRate float64
}

// ProofBlock 证明块
type ProofBlock struct {
	BlockID       string
	EpochID       int
	ProofData     []byte
	Commitments   []byte
	Timestamp     time.Time
	PreviousHash  string
	CurrentHash   string
}

// WaterBearBFT WaterBear共识协议
type WaterBearBFT struct {
	nodeID      int
	totalNodes  int
	faultyNodes int
	isActive    bool
	logger      *log.Logger
}

// TurritopsisManager 轮次管理器
type TurritopsisManager struct {
	epochs       int
	r            int // CBR执行间隔
	currentEpoch int
	isActive     bool
	logger       *log.Logger
}

// NewOptimizedEbbFlow 创建优化后的EbbFlow实例
func NewOptimizedEbbFlow(nodeID, totalNodes, faultyNodes int, logger *log.Logger) *OptimizedEbbFlow {
	return &OptimizedEbbFlow{
		waterbear:    NewWaterBearBFT(nodeID, totalNodes, faultyNodes, logger),
		cbr:          NewCBRProtocol(logger),
		turritopsis:  NewTurritopsisManager(30, 10, logger), // 30 epochs, R=10
		nodeID:       nodeID,
		totalNodes:   totalNodes,
		faultyNodes:  faultyNodes,
		currentEpoch: 0,
		isActive:     false,
		logger:       logger,
	}
}

// NewCBRProtocol 创建CBR协议实例
func NewCBRProtocol(logger *log.Logger) *CBRProtocol {
	return &CBRProtocol{
		reconfiguration: &CBRReconfiguration{},
		keyRefresh:      &CBRKeyRefresh{},
		proofChain:      NewProofChain(logger),
		isActive:        false,
		currentThreshold: 0,
		membership:      []string{},
		logger:          logger,
	}
}

// NewProofChain 创建证明链实例
func NewProofChain(logger *log.Logger) *ProofChain {
	return &ProofChain{
		blocks:          []*ProofBlock{},
		currentBlock:    nil,
		chainLatency:    0,
		verificationRate: 0,
	}
}

// NewWaterBearBFT 创建WaterBear共识实例
func NewWaterBearBFT(nodeID, totalNodes, faultyNodes int, logger *log.Logger) *WaterBearBFT {
	return &WaterBearBFT{
		nodeID:      nodeID,
		totalNodes:  totalNodes,
		faultyNodes: faultyNodes,
		isActive:    false,
		logger:      logger,
	}
}

// NewTurritopsisManager 创建轮次管理器实例
func NewTurritopsisManager(epochs, r int, logger *log.Logger) *TurritopsisManager {
	return &TurritopsisManager{
		epochs:       epochs,
		r:            r,
		currentEpoch: 0,
		isActive:     false,
		logger:       logger,
	}
}

// Start 启动优化后的EbbFlow
func (e *OptimizedEbbFlow) Start() error {
	e.logger.Printf("[EbbFlow] 启动优化后的EbbFlow架构")
	
	// 启动WaterBear共识
	if err := e.waterbear.Start(); err != nil {
		return fmt.Errorf("启动WaterBear失败: %v", err)
	}
	
	// 启动CBR协议
	if err := e.cbr.Start(); err != nil {
		return fmt.Errorf("启动CBR失败: %v", err)
	}
	
	// 启动Turritopsis轮次管理
	if err := e.turritopsis.Start(); err != nil {
		return fmt.Errorf("启动Turritopsis失败: %v", err)
	}
	
	e.isActive = true
	e.logger.Printf("[EbbFlow] 优化后的EbbFlow架构启动成功")
	
	return nil
}

// ExecuteEpoch 执行一个轮次
func (e *OptimizedEbbFlow) ExecuteEpoch(epoch int) error {
	e.logger.Printf("[EbbFlow] 执行轮次 %d", epoch)
	
	// 1. 执行WaterBear共识
	if err := e.waterbear.ExecuteConsensus(epoch); err != nil {
		return fmt.Errorf("WaterBear共识失败: %v", err)
	}
	
	// 2. 检查是否需要执行CBR
	if e.shouldExecuteCBR(epoch) {
		e.logger.Printf("[EbbFlow] 轮次 %d 需要执行CBR", epoch)
		
		// 执行CBR重配置
		if err := e.cbr.ExecuteReconfiguration(epoch); err != nil {
			return fmt.Errorf("CBR重配置失败: %v", err)
		}
		
		// 执行CBR密钥刷新
		if err := e.cbr.ExecuteKeyRefresh(epoch); err != nil {
			return fmt.Errorf("CBR密钥刷新失败: %v", err)
		}
		
		// 更新ProofChain
		if err := e.cbr.proofChain.AddBlock(epoch, "cbr_proof"); err != nil {
			return fmt.Errorf("ProofChain更新失败: %v", err)
		}
	}
	
	e.currentEpoch = epoch
	return nil
}

// shouldExecuteCBR 判断是否需要执行CBR
func (e *OptimizedEbbFlow) shouldExecuteCBR(epoch int) bool {
	// 每R个轮次执行一次CBR
	return epoch%e.turritopsis.r == 0
}

// CBR协议方法
func (cbr *CBRProtocol) Start() error {
	cbr.logger.Printf("[CBR] 启动CBR协议")
	cbr.isActive = true
	return nil
}

func (cbr *CBRProtocol) ExecuteReconfiguration(epoch int) error {
	cbr.logger.Printf("[CBR] 执行重配置，轮次: %d", epoch)
	// 模拟重配置过程
	time.Sleep(100 * time.Millisecond)
	cbr.logger.Printf("[CBR] 重配置完成")
	return nil
}

func (cbr *CBRProtocol) ExecuteKeyRefresh(epoch int) error {
	cbr.logger.Printf("[CBR] 执行密钥刷新，轮次: %d", epoch)
	// 模拟密钥刷新过程
	time.Sleep(150 * time.Millisecond)
	cbr.logger.Printf("[CBR] 密钥刷新完成")
	return nil
}

// ProofChain方法
func (pc *ProofChain) AddBlock(epoch int, proofData string) error {
	block := &ProofBlock{
		BlockID:      fmt.Sprintf("block_%d", epoch),
		EpochID:      epoch,
		ProofData:    []byte(proofData),
		Commitments:  []byte("commitments"),
		Timestamp:    time.Now(),
		PreviousHash: pc.getPreviousHash(),
		CurrentHash:  fmt.Sprintf("hash_%d", epoch),
	}
	
	pc.blocks = append(pc.blocks, block)
	pc.currentBlock = block
	pc.chainLatency = time.Since(block.Timestamp)
	
	return nil
}

func (pc *ProofChain) getPreviousHash() string {
	if len(pc.blocks) == 0 {
		return "genesis"
	}
	return pc.blocks[len(pc.blocks)-1].CurrentHash
}

// WaterBearBFT方法
func (wb *WaterBearBFT) Start() error {
	wb.logger.Printf("[WaterBear] 启动WaterBear-BFT")
	wb.isActive = true
	return nil
}

func (wb *WaterBearBFT) ExecuteConsensus(epoch int) error {
	wb.logger.Printf("[WaterBear] 执行共识，轮次: %d", epoch)
	// 模拟共识过程
	time.Sleep(200 * time.Millisecond)
	wb.logger.Printf("[WaterBear] 共识完成")
	return nil
}

// TurritopsisManager方法
func (tm *TurritopsisManager) Start() error {
	tm.logger.Printf("[Turritopsis] 启动轮次管理器")
	tm.isActive = true
	return nil
}

// 测试优化后的架构
func testOptimizedArchitecture() {
	fmt.Println("=== EbbFlow架构优化测试 ===")
	fmt.Println("")
	
	// 创建日志器
	logger := log.New(log.Writer(), "[EbbFlow-Opt] ", log.LstdFlags)
	
	// 创建优化后的EbbFlow实例
	ebbflow := NewOptimizedEbbFlow(0, 6, 2, logger)
	
	// 启动EbbFlow
	if err := ebbflow.Start(); err != nil {
		fmt.Printf("❌ 启动失败: %v\n", err)
		return
	}
	
	fmt.Println("✅ 优化后的EbbFlow架构启动成功")
	fmt.Println("")
	
	// 模拟执行多个轮次
	epochs := []int{1, 5, 10, 15, 20, 25, 30}
	
	for _, epoch := range epochs {
		fmt.Printf("🔄 执行轮次 %d\n", epoch)
		
		if err := ebbflow.ExecuteEpoch(epoch); err != nil {
			fmt.Printf("   ❌ 轮次 %d 执行失败: %v\n", epoch, err)
		} else {
			shouldCBR := ebbflow.shouldExecuteCBR(epoch)
			if shouldCBR {
				fmt.Printf("   ✅ 轮次 %d 执行成功 (包含CBR)\n", epoch)
			} else {
				fmt.Printf("   ✅ 轮次 %d 执行成功\n", epoch)
			}
		}
		fmt.Println("")
	}
	
	fmt.Println("🎉 EbbFlow架构优化测试完成!")
	fmt.Println("")
	fmt.Println("📊 优化效果:")
	fmt.Println("✅ 移除了ADKR协议调用")
	fmt.Println("✅ CBR集成了密钥刷新功能")
	fmt.Println("✅ ProofChain与CBR紧密耦合")
	fmt.Println("✅ 架构更加简洁高效")
}

func main() {
	testOptimizedArchitecture()
}
